Abstract
Effect of propylgallate (PrG) on the thermotropic behavior of mixtures of dipalmitoylphosphatidyglycerol (DPPG) and Ca 2+ was studied by means of differential scanning calorimetry (DSC). In the case of DPPG or DPPG/Ca (molar ratio, 15 : 1), the transition temperature ( T m ) of the main transition and the subtransition decreased from 40°C to 29°C and from 29°C to 20°C, respectively, with an increase in the concentration of PrG. The addition of PrG to the DPPG/Ca mixture induced a shoulder on the high temperature side in the reheating scan. Neither PrG nor low concentrations of Ca 2+ bind to the Lc phase of DPPG. When the molar ratio of DPPG to Ca was 1 : 1, the subtransition did not occur, that is, only the main transition ( T m = 90° C) appeared. The T m of the main transition was slightly affected by PrG. On the addition of PrG, another metastable endothermic transition peak T m = 78° C) appeared. It is concluded that Ca 2+ and PrG inhibit each other's binding.
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